English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Unified X-ray spectral and timing studies of Cygnus X-1 in the low/hard andhard intermediate state were conducted in a model-independent manner, usingbroadband Suzaku data acquired on 25 occasions from 2005 to 2009 with a totalexposure of ~ 450 ks. The unabsorbed 0.1--500 keV source luminosity changedover 0.8--2.8% of the Eddington limit for 14.8 solar masses. Variations onshort (1--2 seconds) and long (days to months) time scales require at leastthree separate components: a constant component localized below ~2 keV, a broadsoft one dominating in the 2--10 keV range, and a hard one mostly seen in10--300 keV range. In view of the truncated disk/hot inner flow picture, theseare respectively interpreted as emission from the truncated cool disk, a softCompton component, and a hard Compton component. Long-term spectral evolutioncan be produced by the constant disk increasing in temperature and luminosityas the truncation radius decreases. The soft Compton component likewiseincreases, but the hard Compton does not, so that the spectrum in the hardintermediate state is dominated by the soft Compton component; on the otherhand, the hard Compton component dominates the spectrum in the dim low/hardstate, probably associated with a variable soft emission providing seed photonsfor the Comptonization.

Evidence for a Cool Disk and Inhomogeneous Coronae from Wide-band Temporal Spectroscopy of Cygnus X-1 with Suzaku